Sectional-furnace construction



Sept. 11, 1923.

J. F. MCINTIRE sEcTioNAL FURNACE CONSTRUCTION M12 45? F MINT;

JLMM JQKWAM E E E15:5

mull"! IIIU Patented Sept. 11, 1923.

JAMES F. MCINTIRE, OF DETROIT, MICHIGAN, ASSIGNOR TO UNITED-STATES RADI- Avast ewes A'IOR CORPORATION, OF DETROIT, MICHIGAN, A CORPORATION OF NEW YORK.

SECTIONAL-FURNACE CONSTRUCTION.

Application filed May 22,

To all whom it may concern: I

Be it known that L'JAMES F. MGINTIRE, a citizen of the United States of America, residing at Detroit, in the county of Wayne and State of Nfichigan, have invented certain new and useful Improvements in Sectional-Furnace Constructions, of which the following is a specification, reference being had therein to the accompanying drawings,

This invention relates to sectional furnaces and has particular reference to furnaces comprising sections formed with water heating chambers.

It is the object of the invention to secure an increased efficiency in furnaces of the above described character by providing passages for admitting air from the ash pit to the fire box above the fuel so as to commingle said air with the gases of combustion, and to exercise control of the air supply thus established through the means commonly employed to admit outside air to the ash pit, thus insuring an increased delivery of air above the fuel proportionate to any increase in the amount of air rising from the ash pit through the grate.

A further object is to provide means for delivering a limited supply of air to the fire box above the burning fuel, independently of the variable supply derived from the ash pit.

In the drawings:

Figure l is a rear perspective view of the front unit of a sectional waterjheating furnace.

Figure 2 is a central transverse section through said unit, showing also the next ad- 1 jacent unit, said View being taken on line 2-2 of Figure 1. I

Figure 3 is a vertical cross section of the front unit, taken on line 3-3 of Figure 1.

In theseviews the reference character A designates a unit of a sectional water heating furnace and B isthe adjacent unit of said furnace at the rear of unitA. In the section B, there is formed a large central fire box opening 0, which openingis extended partially into the section A as indicated at D. v I

Within the openings C and D isarranged the grate C beneath which said units are formed with an ash pit C The section A has an openingE through which fuel may be delivered to the fire box, and a door E upon said section normally closes said 1920. Serial No. 383,389.

opening. At a somewhat lower point the section A is formed with a clinker opening F, which is positioned just above the level of the grate C, and is intended primarily for the removal of any clinkers or large lumps of noncombustible matter which may accumulate upon the grate, A door fGis provided upon the front of the section A to control the opening F, and in said door there is formed oneor more small apertures H through which air may be admitted to said opening, and thence such air may rise through a vertical passage I formed cen trally in the section A which passage dis-f charges rearwardly as indicated at I just above the normal fuel level. v

The section A is further formed with two vertical air passages J one ofwhich is 10 cated at each side'of the passage 1, said passages J communicating at their. lower ends with the ash pit C as is best seen'in v Figure 3, and at their upper ends discharging rearwardly above the normal fuel level,

as indicated at J. Such 'air as rises through the passages J is derived from the ash pit C and is controlled in common with such,

air as rises through the grate .C by the usual adjustable damper K, provided in the ash pit door K. To insure against the fuel clogging theopening F, it is preferred to mount at the back of said opening a supplementary closure L which is linked as indicated at L to the door, G so as to be opened or closed in unison with saiddoor.

From the foregoing description, it isseen that the invention provides for a constant through the passages JJ Considerable increase in efficiency is thus secured, since thereis necessarily a more rapid generation of gases of combustion above the fuel when the draft through the fuel is increased, and

to properly support combustion of such gases and prevent their escape unconsumed,

the air supply above the mass of fuel should be varied; correspondingly to changes in the draft through the fuel. It is furthermore, to be noted that the air rising both through the passage I and passages J is subjected to a high temperature due to close proximity of the burning fuel, and consequently is preheated on entering the combustion chamber.

.WVhat I claim as my invention is:

1. A front unit for sectional furnaces formed with an ash pit and an opening thereinto, a closure for said opening, and an inverted Lshaped passage rising from said opening and discharging adjacent the normal fuel level of the furnace.

2. A front unit for sectional furnaces having a recess in the rear face thereof forming a portion of the combustion chamber and having an opening in its lower portion for communication with the ash pit, and provided with an air passage rising from said ash pit opening and discharging into the recess aforesaid, opening adjacent the normal fuel level, and a closure for the ash pit opening.

3.A front unit for sectional furnaces having a fuel feed opening and an ash pit opening, closures controlling said openings, and an air passage rising from the ash pit opening, and discharging rearwardly substantially at the bottom level of the fuel feed opening.

i. A front unit for sectional furnaces formed with a fuel feed opening and a clinker cleanout opening, and with a passage rising from the latter opening and discharging adjacent the bottom of the former opening, and closures for said openings, the closure of the cleanout opening having an air inlet.

5. A front unit for sectional furnaces having its rear face recessed to form portion of a combustion chamber, a fuel feed opening communicating with the upper portion of said combustion chamber, a clinker cleanout opening communicating with the lower portion of the combustion chamber, and an air passage rising from the cleanout opening and discharging into the combustion chamber adjacent the bottom of the fuel opening, a closure for the fuel feed opening and a closure for the cleanout opening having an air inlet therein.

6. A front unit for sectional furnaces, having a fuel feed opening, an ash pit opening and a clinker cleanout opening, closures for said openings upon the front of said unit, an air passage rising from the cleanout opening and discharging adjacent the fuel feed opening, and air passages, arranged one at each side of the first mentioned air passage, rising from the ash pit opening and discharging in substantial horizontal alignment with the discharge of the first mentioned air passage.

7. A front unit for sectional furnaces having the rear face thereof recessed to form a portion of a combustion chamber, and having a fuel feed opening communicating with the upper portion of the combustion chamber, and a clinker cleanout opening communicating with the lower portion of said chamber, and having an ash pit opening in its lower portion, and having an air passage rising from the said cleanout opening and discharging into the combustion chamber adjacent the normal fuel level therein, and formed with similarly discharging air passages at each side of the first mentioned air passage, rising from the ash pit openin 8. A front unit for sectional furnaces, having its rear face recessed to form a portion of a combustion chamber, and having an air passage discharging into said combustion chamber substantially at the normal fuel level therein.

9. A front unit for sectional furnaces, having provision for admitting both a variable and a constant supply of air to the combustion chamber, at the normal fuel level therein.

10. A front unit for sectional furnaces having an ash pit opening, an air passage rising from said opening and discharging substantially at the normal fuel level in the furnace and means for admitting air at normal fuel level independent of said passage.

11. In a sectional furnace, a hollow front unit comprising a water container formed with an ash pit, and an opening thereinto, a closure for said opening, and a passage leading from said opening and extending upwardly through said water container, said passage discharging adjacent the normal fuel level of the furnace.

12. A front unit for sectional furnaces formed with a fuel feed opening, a clinker clean-out opening and a passage in communication with said clean-out opening, and terminating adjacent to said feed opening, closures for said openings, the closures of the clean-out opening having an air inlet, and means for directing rearwardly the air discharged from said passage.

13. A front unit for furnaces having a fuel feed opening and having an ash pit opening, closures for said openings, and separate passages leading from said ash pit opening and terminating adjacent to said fuel feed opening.

14:- A front unit for furnaces having a fuel feed opening and having an ash pit opening, closures for said openings, separate passages leading from said ash pit opening and terminating adjacent to said fuel feed opening, said unit also having a clinker clean-out opening, a closure therefor, and a passage leading from said clinker cleanout opening and terminating adjacent to said fuel feed opening.

15. In a furnace, the combination with grates for supporting the fuel, and an ash pit beneath said grates, of a unit having an opening through which ashes may be removed from said pit, a closure for said opening having an opening for admitting air to said pit, a closure for the opening in the closure aforesaid, and an air passage rising from said ash pit and terminating adjacent to the normal level of the fuel on said grates.

16. A front unit for sectional furnaces formed with a fuel feed opening, a clinker clean-out opening and an air passage rising from the clean-out opening and discharging opening and adapted to prevent the fuel from clogging said air passage.

In testimony whereof I affix my signature.

JAMES F. MOINTIRE. 

